I know this post is old, but I can at least describe the nature of the problem: the game reloads the OW palettes when you exit menus, and the hack apparently doesn't touch that reloading routine. The result is that the palettes (and possibly even tile animations, judging by what happens to your ice) for the "default" season are loaded. The same problem exists in JPAN's hacked engine, when using the "extended" palettes for his OW mods.